This will just be a cotinuously updated list of Vim keys/motions/commands I found by accident, mostly through mis-clicks, and sometimes by reading the friendly manual.
S- Delete line and start insert (can have number prepended to delete
nlines) - https://vimhelp.org/change.txt.html#S
- Delete line and start insert (can have number prepended to delete
SHIFT+k- When pressed in visual mode over a keyword, brings you to help documentation for that keyword
- https://medium.com/code-art/vim-powerful-shift-k-748fec296319